68349857 has 2 divisors, whose sum is σ = 68349858. Its totient is φ = 68349856.

The previous prime is 68349817. The next prime is 68349871. The reversal of 68349857 is 75894386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60902416 + 7447441 = 7804^2 + 2729^2 .

It is a cyclic number.

It is not a de Polignac number, because 68349857 - 2¹⁸ = 68087713 is a prime.

It is not a weakly prime, because it can be changed into another prime (68349817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34174928 + 34174929.

It is an arithmetic number, because the mean of its divisors is an integer number (34174929).

Almost surely, 2^68349857 is an apocalyptic number.

It is an amenable number.

68349857 is a deficient number, since it is larger than the sum of its proper divisors (1).

68349857 is an equidigital number, since it uses as much as digits as its factorization.

68349857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 50.

The square root of 68349857 is about 8267.3972325031. The cubic root of 68349857 is about 408.8643109729.

The spelling of 68349857 in words is "sixty-eight million, three hundred forty-nine thousand, eight hundred fifty-seven".